A good coach, or a good general for that matter, would not want to hurt the morale of the team/troops by coming forward and stating how bad they did or what they had not done well.
There was a college football coach in the 1960s after a loss who went on television and verbally berated his own team. Undoubtedly the team would have agreed with him . I thought that he was an idiot, but that was a very long time ago.
What you say to the troops themselves and what you report up the chain are two different things; or, there are two different ways of presenting it. It depends on the audience.